Since the 1960s, coronary artery bypass grafting (CABG) has helped people with heart disease live healthier and longer lives. But some people are left with memory and focus problems. These problems can happen right after surgery and may be long-lasting.
CABG is done to treat coronary artery disease (CAD). CAD happens when fatty plaque builds up in the arteries that bring oxygen to the heart. This buildup blocks blood flow. CABG reroutes blood flow around a blockage using vessels from other parts of the body. During surgery, a person's heart may be stopped and a heart-lung machine may be used to bring oxygen to the body.
Some things that are thought to cause the cognitive problems that some people have are:
Some studies have also found that cognitive changes were the same in people with CAD who did not have CABG. This may mean that the changes do not have anything to do with the surgery and more to do with the disease it was treating. More studies may show that the risk of these problems may be due to CAD and not CABG. More research needs to be done.
Researchers have found that age and having less formal education may raise a person’s risk. Older adults are more likely to have problems adjusting to decreases in brain blood flow during surgery. More education may raise a person’s ability to make up for the cognitive problems, but this is still being studied.
Research is being done see if making small changes to the surgery will help prevent these problems. There are also other surgeries that can be used, such as angioplasty. It inserts a tube with a balloon into the blocked artery. The balloon is inflated and opens the artery. A mesh stent is often used to keep it open. However, this surgery is not right for everyone.
Until we know more, talk to your doctor if you need CABG and are worried about cognitive problems. Your doctor can talk about your risk based on your medical history, current health problems, and other factors.
American Psychological Association
National Heart, Lung, and Blood Institute
Mental Health Canada
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Last reviewed June 2021 by EBSCO Medical Review Board Last Updated: 6/10/2021